It's hard to find used super comp at a decent savings. Your best bet is to get a couple people to go in on a bulk buy directly from SL. If you buy 18,500 pieces the price decreases to 13.5 cent each, if you buy 60,000 the price goes down to 12.6 cents per.
When practicing I shoot 600ish rounds, and spend 15 min at the end picking up brass and recover 95 percent of them.
While shooting locals, I pick up my marked cases as i'm walking down to paste and retrieve about 80 percent.
Major matches are lost brass, and typically are 250ish rounds. Assuming you shoot brand new brass, it adds $31 to your match fee, which is insignificant in the grand theme of things.